Brower, L.P. and R.M. Pyle. 2004. The interchange of migratory monarchs between Mexico and the Western United States, and the importance of floral corridors in the fall and spring migrations. In Conserving Migratory Pollinators and Nectar Corridors in Western North America, edited by G. Nabhan, 144-166. Tucson: University of Arizona Press.

Jepsen, S. and S.H. Black. 2015. Understanding and conserving the Western North American monarch population. In Monarchs in a Changing World: Biology and Conservation of an Iconic Butterfly, edited by K. Oberhauser, S. Altizer, and K. Nail, 147-156. Ithaca: Cornell University Press.

Kartesz, J.T., The Biota of North America Program (BONAP). 2015. North American Plant Atlas. (http://bonap.net/napa). Chapel Hill, N.C. [maps generated from Kartesz, J.T. 2015. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP). (in press)].

Pyle, R.M. 2015. Monarchs in the mist: new perspectives on monarch distribution in the Pacific Northwest. In Monarchs in a Changing World: Biology and Conservation of an Iconic Butterfly, edited by K. Oberhauser, S. Altizer, and K. Nail, 237-247. Ithaca: Cornell University Press.

Vandenbosch, R. 2007. What do monarch population time series data tell us about eastern and western population mixing? Journal of the Lepidopterists’ Society 61(1):28-31.

Wassenaar, L.I., and K.A. Hobson. 1998. Natal origins of migratory monarch butterflies at overwintering colonies in Mexico: New isotopic evidence. Proceedings of the National Academy of Sciences 95:15436-15439.

About the Western Monarch Milkweed Mapper:

The Western Monarch Milkweed Mapper is a project through the partnership of The Xerces Society, Idaho Department of Fish and Game, Washington Department of Fish and Wildlife, National Fish and Wildlife Foundation, and US Fish and Wildlife Service. Learn more about this project.